Ecto.Adapters.DynamoDB.Info.indexed_attributes

You're seeing just the function indexed_attributes, go back to Ecto.Adapters.DynamoDB.Info module for more information.
Link to this function

indexed_attributes(repo, table_name)

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Specs

indexed_attributes(Ecto.Repo.t(), table_name_t()) :: [String.t()]

returns a list of any indexed attributes in the table